Sizing, coining, or squeezing attachment for power presses



x *N- w. DORMAN SIZINGQ COIHINQ, 0R SQUEEZING ATTACHIENT FOR POWER PRESSES Patented Aug. l2, 1930 NEAL rw. DoBnAitonTOLi-ino, OHIO, AssieisiOn-rro ms; TOLEDOMAOHINE a TOOL COMPANY, or TOLEDO, onrdnconronnmron Vor, OHIO sIzING, comme, onL sQUEEzrNG nmrnoiimnivm non POWER PaEssEs Application Viled May 12,

In manufacturing shackles, pitmen, eccentric straps, and other machine elements which arek adapted-to move in a plane between two adjacent surfaces, itis important lthat the thickness of such elements be gaged with the utmost accuracy, in order that they may move freely when assembled, without any appreciable transverse play. Recently, itl has become a common practice to size such elements in a power press by a p rocessknown as squeezing. In this process, work-engaging pressure members with flat or formed faces take the place of the usual punching or i shaping dies, such pressure members being accurately gaged tosqueeze the to the desired thickness. e

In carrying out the squeezing process, as above described, it frequently happens that the work piecetwill stick to the upper squeez-J ing or pressure member and be lifted there- "by, and sometimes the operator, without A noticing this, will insert the next work piece beneath the piece already inthe press.` The result is quite disastrous, causing 'the two pieces Vto he squeezed instead of One. The tremendous pressure thus developed imposes a strain on the machine, which throws it out of adjustment, if it does not wreck it altorether. i

work piece With the above features in mind, the Object 'locatedatfopposite ends of the block/7 and` are accurately gaged to the thickness deof the present invention is to makeit impossible for such conditionsto occur, by solconstructing the squeezing or pressure members that a work piece cannot be insertedsbetween them until the preceding piece has been removed. This object is accomplished by yprovidinga bottom pressure Lmember of novel and improved construction, which is adapted to be attached to a squeezing press of the type heretofore used, without any alteration in the latter.

The specific construction' of the invention, and the advantages resulting therefrom, will be more particularly described in connection Y with the accompanying drawing,-in which 1928. serial 116,271,167.

the single :ligure represents i a portion `a s powerfpress, partlyin elevation and1 partly in section, with the invention `applied thereto. "11n the drawing, the numeral fl indicates the frame of a power press,lwhich maybe vof any` 'suitable construction` having` `a Abed, 2, `i

preferably with a bolster Sisecure'd thereon, and with upright :portionsL'extendingi'upwardlyy therefrom and'fconstituting guides for a power Operated plunger `5: The `plunger `5 isuconstructed to receive a die or pressure block' and anvopposin'g die or 'pressure block an intermediate block 9 witha hardened Vface 7,with ahardened face8,fis mounted on the4 vbolster 3. In accordance with the? invention,

Surrounding eachguide y1l-1is an expan'sile Vlcoil springlQ which bears against lthe-respective seats 13 and 14 formed .on the end: portions {Ofithef blocks 7 and 9..v` These springs *are 'strongl enoughto raise the block9as the f-plungerf 5 `moves upwardly',l;.the` upward *movement Ofi theblock 9 'being limited: by

suit-able"4 stops l5V adjustablyheld onfthejfupper ends of the guides 11 bylo'ck nutslG, located within'r'ecesses 17 in the'block 7.5i

n The work,as indicated at 18,v is adapted to 'be squeezedw'loetween opposed faces ofthe blocks/7 and 9, respectively. Stops 19 `are 'sire`d, and thestroke of the plunger 5 is also piece 18to be'in'serte'd, but the spacebetween stricted` that it will be impossible `to insertla secondi workffpiece u18 until i the, preceding piece has been removed. Atthe same -time l:the 'blockf`9 is arranged to transmit the full power fthe plunger toithe pieceftoi be the faces ofthe blocks 7 and 59 will be so 're- While I have shown and described in detail only one specific embodiment of the invention, it will be understood that the same ma be modified to a considerable extent wit out departing from the scope of the invention as claimed.

What I claim is:

1. In a power press, the combination with astatonar bed, a pressure member movable toward an away from the same, and blocks for attachment respectively to said bed and said pressure member to gage the thickness to which the work piece is to be squeezed, of vertical guide means secured in and extending upwardly from -thelowermost block, anintermediate block disposed between the first mentioned blocks and mounted for vertical sliding movement on said guide means, resildetermined gage on the faceof the lower block to positively limit the minimum'distance between said faces to the desired thickness of the workpiece, means positivel limting the maximum separation of said aces to less than twice the thickness of the workpiece, and means for maintaining the intermediate block in its uppermost position when the plunger is raised out of engagement therewith.

In; testimony, whereof, I have hereunto lsigned my name to this specification.

NEAL W. DORMAN.

ient means tending to move the intermediate block upwardly to its uppermost position when it is releasedby the upward travel of the pressure member, and means for positively hmiting the 4upward movement of the intermediate block, said last mentioned means being secured to and adjustable vertically on said uide means. y

2. n a power press, the combination with a stationary bed, a pressure member movable toward and away `from the same, and blocks for attachment respectively to said bed and said pressure `member' tov gage the thickness to which the work piece is to be squeezed,

of vertical guide means, an intermediate block disposed between the first mentioned blocks an mounted for vertical sliding movement on said guide means, means for reciprocating said pressure member, means for causing the intermediate block to move with the pressure member throughout the lower part of its` stroke, and means for positively limiting. the y upper position of the intermediate block so that the space between said intermediate block and thelower block is less than twice the thickness of the piece to be squeezed.r

3. In a power press, the combination of a stationa bed, a block mounted thereon, vertical gui e means secured to and extending upwardly from said block, a movable block giided on said guide means, a pressure memr o erable to force the movable block down- Y wa yto operate on the work, stops on said guide means to limit the upward movementof in its highest position.

4. A squeezing device comprising a stathe movable block, and spring means to force i tionary bed, a block mounted thereon, a ver-V tically movable lunger above said block, a vertically mova le intermediate block between the plunger and the lower block, said blocks having opposed flat faces, stops of pre- 

